/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

/* SDL stuff -- "SDL_sysjoystick.c"

MacOS joystick functions by Frederick Reitberger

The code that follows is meant for SDL. Use at your own risk.

*/

#include <string.h>

#include <InputSprocket.h>

#include "SDL_error.h"

#include "SDL_joystick.h"

#include "SDL_sysjoystick.h"

#include "SDL_joystick_c.h"

/* The max number of joysticks we will detect */

#define MAX_JOYSTICKS 16

/* Limit ourselves to 32 elements per device */

#define kMaxReferences 32

#define ISpSymmetricAxisToFloat(axis) ((((float) axis) - kISpAxisMiddle) / (kISpAxisMaximum-kISpAxisMiddle))

#define ISpAsymmetricAxisToFloat(axis) (((float) axis) / (kISpAxisMaximum))

static ISpDeviceReference SYS_Joysticks[MAX_JOYSTICKS];

static ISpElementListReference SYS_Elements[MAX_JOYSTICKS];

static ISpDeviceDefinition SYS_DevDef[MAX_JOYSTICKS];

struct joystick_hwdata

};

/* Function to scan the system for joysticks.

* Joystick 0 should be the system default joystick.

* This function should return the number of available joysticks, or -1

* on an unrecoverable fatal error.

*/

int SDL_SYS_JoystickInit(void)

{

static ISpDeviceClass classes[4] = {

kISpDeviceClass_Joystick,

#if kISpDeviceClass_Gamepad

kISpDeviceClass_Gamepad,

#endif

kISpDeviceClass_Wheel,

0

};

OSErr err;

int i;

UInt32 count, numJoysticks;

if ( (Ptr)0 == (Ptr)ISpStartup ) {

SDL_SetError("InputSprocket not installed");

return -1; // InputSprocket not installed

}

if( (Ptr)0 == (Ptr)ISpGetVersion ) {

SDL_SetError("InputSprocket not version 1.1 or newer");

return -1; // old version of ISp (not at least 1.1)

}

ISpStartup();

/* Get all the joysticks */

numJoysticks = 0;

for ( i=0; classes[i]; ++i ) {

count = 0;

err = ISpDevices_ExtractByClass(

classes[i],

MAX_JOYSTICKS-numJoysticks,

&count,

&SYS_Joysticks[numJoysticks]);

numJoysticks += count;

}

for(i = 0; i < numJoysticks; i++)

{

ISpDevice_GetDefinition(

SYS_Joysticks[i], sizeof(ISpDeviceDefinition),

&SYS_DevDef[i]);

err = ISpElementList_New(

0, NULL,

&SYS_Elements[i], 0);

if (err) {

SDL_OutOfMemory();

return -1;

}

ISpDevice_GetElementList(

SYS_Joysticks[i],

&SYS_Elements[i]);

}

ISpDevices_Deactivate(numJoysticks, SYS_Joysticks);

return numJoysticks;

}

/* Function to get the device-dependent name of a joystick */

const char *SDL_SYS_JoystickName(int index)

{

static char name[64];

int len;

/* convert pascal string to c-string */

len = SYS_DevDef[index].deviceName[0];

if ( len >= sizeof(name) ) {

len = (sizeof(name) - 1);

}

memcpy(name, &SYS_DevDef[index].deviceName[1], len);

name[len] = '\0';

return name;

}

/* Function to open a joystick for use.

The joystick to open is specified by the index field of the joystick.

This should fill the nbuttons and naxes fields of the joystick structure.

It returns 0, or -1 if there is an error.

*/

int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)

{

int index;

UInt32 count, gotCount, count2;

long numAxis, numButtons, numHats, numBalls;

count = kMaxReferences;

count2 = 0;

numAxis = numButtons = numHats = numBalls = 0;

index = joystick->index;

/* allocate memory for system specific hardware data */

joystick->hwdata = (struct joystick_hwdata *) malloc(sizeof(*joystick->hwdata));

if (joystick->hwdata == NULL)

{

SDL_OutOfMemory();

return(-1);

}

memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));

strcpy(joystick->hwdata->name, SDL_SYS_JoystickName(index));

joystick->name = joystick->hwdata->name;

ISpElementList_ExtractByKind(

SYS_Elements[index],

kISpElementKind_Axis,

count,

&gotCount,

joystick->hwdata->refs);

numAxis = gotCount;

count -= gotCount;

count2 += gotCount;

ISpElementList_ExtractByKind(

SYS_Elements[index],

kISpElementKind_DPad,

count,

&gotCount,

&(joystick->hwdata->refs[count2]));

numHats = gotCount;

count -= gotCount;

count2 += gotCount;

ISpElementList_ExtractByKind(

SYS_Elements[index],

kISpElementKind_Button,

count,

&gotCount,

&(joystick->hwdata->refs[count2]));

numButtons = gotCount;

count -= gotCount;

count2 += gotCount;

joystick->naxes = numAxis;

joystick->nhats = numHats;

joystick->nballs = numBalls;

joystick->nbuttons = numButtons;

ISpDevices_Activate(

1,

&SYS_Joysticks[index]);

return 0;

}

/* Function to update the state of a joystick - called as a device poll.

* This function shouldn't update the joystick structure directly,

* but instead should call SDL_PrivateJoystick*() to deliver events

* and update joystick device state.

*/

void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)

{

int i, j;

ISpAxisData a;

ISpDPadData b;

//ISpDeltaData c;

ISpButtonData d;

for(i = 0, j = 0; i < joystick->naxes; i++, j++)

{

Sint16 value;

ISpElement_GetSimpleState(

joystick->hwdata->refs[j],

&a);

value = (ISpSymmetricAxisToFloat(a)* 32767.0);

if ( value != joystick->axes[i] ) {

SDL_PrivateJoystickAxis(joystick, i, value);

}

}

for(i = 0; i < joystick->nhats; i++, j++)

{

Uint8 pos;

ISpElement_GetSimpleState(

joystick->hwdata->refs[j],

&b);

switch(b) {

case kISpPadIdle:

pos = SDL_HAT_CENTERED;

break;

case kISpPadLeft:

pos = SDL_HAT_LEFT;

break;

case kISpPadUpLeft:

pos = SDL_HAT_LEFTUP;

break;

case kISpPadUp:

pos = SDL_HAT_UP;

break;

case kISpPadUpRight:

pos = SDL_HAT_RIGHTUP;

break;

case kISpPadRight:

pos = SDL_HAT_RIGHT;

break;

case kISpPadDownRight:

pos = SDL_HAT_RIGHTDOWN;

break;

case kISpPadDown:

pos = SDL_HAT_DOWN;

break;

case kISpPadDownLeft:

pos = SDL_HAT_LEFTDOWN;

break;

}

if ( pos != joystick->hats[i] ) {

SDL_PrivateJoystickHat(joystick, i, pos);

}

}

for(i = 0; i < joystick->nballs; i++, j++)

{

/* ignore balls right now */

}

for(i = 0; i < joystick->nbuttons; i++, j++)

{

ISpElement_GetSimpleState(

joystick->hwdata->refs[j],

&d);

if ( d != joystick->buttons[i] ) {

SDL_PrivateJoystickButton(joystick, i, d);

}

}

}

/* Function to close a joystick after use */

void SDL_SYS_JoystickClose(SDL_Joystick *joystick)

{

int index;

index = joystick->index;

ISpDevices_Deactivate(

1,

&SYS_Joysticks[index]);

}

/* Function to perform any system-specific joystick related cleanup */

void SDL_SYS_JoystickQuit(void)

{

ISpShutdown();

}